M4‑0.70 x 40mm Button Socket Cap Screw – Class 10.9, Black Oxide, ISO 7380

Designed for metric fastening applications requiring extended reach and dependable strength, this M4‑0.70 x 40mm button socket cap screw is manufactured from high‑strength Class 10.9 alloy steel and produced to ISO 7380 standards. The 40mm length provides deep thread engagement for secure fastening through thicker or stacked components, while the low‑profile button head helps maintain a clean, streamlined appearance in exposed or clearance‑limited assemblies. Featuring an internal hex drive for precise torque control, it is finished with a thermal black oxide coating that reduces glare, offers mild corrosion resistance, and delivers a uniform technical finish suitable for machinery, tooling, and precision mechanical applications.